reservationist

[ rez-er-vey-shuh-nist ]
/ ˌrɛz ərˈveɪ ʃə nɪst /

noun

a person who makes or takes reservations, as at an airline office; reservation clerk.

Origin of reservationist

An Americanism dating back to 1915–20; reservation + -ist
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019